Riser for sprinkler heads



FIG. 1 is a top plan view of a riser for sprinkler heads showing our new design, the bottom being plain and unornamented;

FIG. 2 is a front elevational view thereof; and

FIG. 3 is a side elevational view thereof, the opposite side and rear being substantially similar in appearance. 

The ornamental design for a riser for sprinkler heads, as shown and described. 